Question

我有两个不同的字符串，一个用于日期，另一个用于时间。我把两者结合起来了，我想从中得到一个NSDate。

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
NSString *format = [NSDateFormatter dateFormatFromTemplate:@"yyyy-MM-dd" options:0 locale:[NSLocale currentLocale]];
[formatter setDateFormat:format];
NSString *date = [formatter stringFromDate:temp];
NSLog(@"%@",date); //This shows 10/11/2013
NSDateFormatter *formatterTime = [[NSDateFormatter alloc] init];

NSString *formatTime = [NSDateFormatter dateFormatFromTemplate:@"j:mm" options:0 locale:[NSLocale currentLocale]];
[formatterTime setDateFormat:formatTime];
NSDate *tTime = [formatterTime dateFromString:[self.arrayOrari objectAtIndex:a]];
NSString *time = [formatterTime stringFromDate:tTime];
NSLog(@"%@",time); //This shows 6:58 PM

NSString *dateTime = [NSString stringWithFormat:@"%@ %@",date,time];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSString *formatString = [NSDateFormatter dateFormatFromTemplate:@"yyyy-MM-dd j:mm" options:0 locale:[NSLocale currentLocale]];
[dateFormatter setDateFormat:formatString];
myMed.orario = [dateFormatter dateFromString:dateTime];
NSLog(@"%@",myMed.orario); //This shows NULL

我已经尝试了大约四个小时，但我无法解决这个问题。有什么想法吗？

更新：我按照建议尝试了这个：

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
NSString *format = [NSDateFormatter dateFormatFromTemplate:@"yyyy-MM-dd" options:0 locale:[NSLocale currentLocale]];
[formatter setDateFormat:format];
NSString *date = [formatter stringFromDate:temp];
NSLog(@"%@",date); //This shows 10/11/2013
NSDateFormatter *formatterTime = [[NSDateFormatter alloc] init];

NSString *formatTime = [NSDateFormatter dateFormatFromTemplate:@"HH:mm" options:0 locale:[NSLocale currentLocale]];
[formatterTime setDateFormat:formatTime];
NSDate *tTime = [formatterTime dateFromString:[self.arrayOrari objectAtIndex:a]];
NSString *time = [formatterTime stringFromDate:tTime];
NSLog(@"%@",time); //This shows 18:58

NSString *dateTime = [NSString stringWithFormat:@"%@ %@",date,time];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSString *formatString = [NSDateFormatter dateFormatFromTemplate:@"yyyy-MM-dd HH:mm" options:0 locale:[NSLocale currentLocale]];
[dateFormatter setDateFormat:formatString];
myMed.orario = [dateFormatter dateFromString:dateTime];
NSLog(@"%@",myMed.orario); //This shows NULL

Answer 1

你的错误已经结束了：

NSString *formatString = [NSDateFormatter dateFormatFromTemplate:@"yyyy-MM-dd j:mm" options:0 locale:[NSLocale currentLocale]];

而不是

@"yyyy-MM-dd j:mm"

尝试：

@"yyyy-MM-dd hh:mm"

Answer 2

好的，我终于做到了！

最终的格式化字符串必须是：“MM / dd / yyyy HH：mm”。我确实尝试使用“MM-dd-yyyy HH：mm”，但它不起作用，我不得不使用精确的分隔符。

从字符串格式化日期返回NULL

2 个答案: